# CypherAir X — Offline PGP + Post-Quantum

> Offline PGP + Post-Quantum (iPhone/iPad app by 添任 陈.)

- Source: https://appshunter.io/ios/app/cypherair-x/id6770363181 (this page in markdown: same URL + `.md`)
- Developer: [添任 陈](https://appshunter.io/developer/1896730081)
- Category: Utilities, Developer Tools
- Price: $2.99
- Age rating: 4+
- Requires: iOS 27.1 · 93 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2026-08-24
- Data updated: 2026-11-05

## What is CypherAir X?

CypherAir X is an offline OpenPGP tool built for the post-quantum era: encryption designed to withstand future quantum computers, and private keys that physically cannot leave your device.

POST-QUANTUM CRYPTOGRAPHY (RFC 9980)
Generate OpenPGP keys that combine ML-KEM encryption and ML-DSA signatures with classical curves — up to ML-KEM-1024 with X448 in the High tier. The Encrypt screen shows when a message is fully quantum-safe: every recipient key must be post-quantum.

DEVICE-BOUND KEYS, SEALED IN HARDWARE
Device-Bound key families are created inside the Secure Enclave. Their private key material is non-exportable — it cannot be copied, backed up, or extracted — and using it always requires biometric authentication. Device-Bound Post-Quantum keys use split custody: the post-quantum half lives in the Secure Enclave while the classical half is sealed to the device.

NINE KEY FAMILIES, TWO CUSTODY MODELS
Portable keys can be exported and backed up: Legacy (Curve25519, OpenPGP v4 — works with GnuPG and all major PGP tools), Modern and Modern · High (OpenPGP v6, Ed25519 or Ed448, AEAD encryption, Argon2id passphrase protection), and Post-Quantum in two strengths. Device-Bound keys are sealed to this device and cannot be exported: Legacy, Modern, and Post-Quantum in two strengths.

EVERYTHING STAYS ON THIS DEVICE
• Zero network connections. No telemetry, no analytics, no accounts — nothing to leak.
• Encrypt, decrypt, sign, and verify text and files, streamed for large data.
• Share public keys by QR code using the system Camera — the app itself needs no camera permission.
• Manage contacts, key expiry, and revocation; protect the app with biometric lock.
• Practice first in the Guided Tutorial — an isolated sandbox that never touches your real keys or data.

OPEN SOURCE
First-party code is dual-licensed GPL-3.0-or-later OR MPL-2.0.
Source: https://github.com/cypherair/cypherair

## Is CypherAir X safe?

Not enough ratings yet to assess CypherAir X.

## Is CypherAir X legit?

CypherAir X has limited verification signals. The AppsHunter Legitimacy Score for CypherAir X is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.7.0 — 2026-11-05

No release notes.

## More apps by 添任 陈

- [Net Error](https://appshunter.io/ios/app/net-error/id6805158210)

All apps by 添任 陈: https://appshunter.io/developer/1896730081

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-05.*